Year 3 Review strategies for adding and subtracting across 10 worksheet

“Doubles in threes” is free to print, with no account. It is the first sheet in the Year 3 maths unit “Review strategies for adding and subtracting across 10”, for children aged 7 to 8, and takes about 20 minutes.

Print it on A4. The child's pages come first; the answers, and what each wrong answer tells you, are on the grown-up page that follows. Weeks 1 to 2 of the year, 10 sheets in the unit.

Free sample · answers on the last page

Doubles in threes

Name: ____________ · Date: ____________
Year 3 · Maths · about 20 minutes
Answers are on the grown-up page

Today I can add three numbers by finding a double or near double first.

A Look back3 min

1.
3 + 3 =
2.
10 + 7 =
3.
9 + 1 =

B Watch me, then you4 min

Mia has 4 stickers, 5 stickers and 4 stickers. How many stickers does she have altogether?

Watch me

The two 4s are a double. 4 + 4 = 8.

Add the last number: 8 + 5 = 13.

Mia has 13 stickers altogether.

Now you

1.
Ali has 3 cards, 6 cards and 3 cards. How many cards altogether?

C Your turn6 min

Look for two numbers that are the same or one apart. Add those first.

1.
5 + 5 + 1 =
2.
5 + 5 + 2 =
3.
5 + 6 + 2 =
4.
2 + 5 + 6 =

Say it out loud: Which two numbers did you add first in each one, and how did you know they were the best pair?

D Spot the mistake3 min

Kit says: “5 + 2 + 5 = 13. I can't add the two 5s first, because the 2 is in the middle.”

1.
Kit can swap the numbers. Add the double first, then add the last number. Total:

E Think deeper3 min

1.
6 + 6 + is more than 14. Which numbers from 1 to 10 could go in the box? Write them all.

How did it feel?

I can do it Nearly Not yet

For the grown-up

Doubles in threes · 2 minutes to read

Answers, and what a wrong one tells you

A

1. 6

2. 17

3. 10

B

1. 12 If your child writes 9, they have only added 3 + 6 and missed the last 3. Add the double first: 3 + 3 = 6, then 6 + 6 = 12.

C

1. 11

2. 12 If your child writes 10, they have stopped after the double. Add the last 2 to 10 to get 12.

3. 13 If your child writes 11, they have only added 5 + 6. The 2 still needs adding. Use the near double: 5 + 6 is one more than 5 + 5, so 11. Then 11 + 2 = 13.

4. 13

D

1. 12 If your child writes 13, they have copied Kit. Swap the order to 5 + 5 + 2. Then 5 + 5 = 10, and 10 + 2 = 12.

E

1. 3, 4, 5, 6, 7, 8, 9, 10

Words to use

Say“Which two numbers could you add first to make it easy?”

Instead of“Add them in the order they are written, without looking for a pair.”

After the sheet

Make three small piles of socks or coins. Find two piles that match or are one apart. Add those, then add the third pile.

Tick what your child got right in StudyDen. Anything missed comes back in a later Look back box, so there's no need to redo the sheet.

The rest of this unit

9 more sheets come with a StudyDen plan, in teaching order:

Three numbers, one total(with a plan)
Adding in any order(with a plan)
Pairs to 10 first(with a plan)
Pick the Smart Strategy(with a plan)
Bridging through ten(with a plan)
Counting on to subtract(with a plan)
Subtracting to and from 10(with a plan)
Subtracting by bridging 10(with a plan)
Cracking the Secret Numbers(with a plan)

Every Year 3 maths worksheet

The worksheets plan opens a printable sheet for every lesson in Years 1 to 6, each with its answers on a separate page for you. It costs £6.99 a month or £59 a year for the whole family, with no free trial.

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